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I have had similar trouble. I took both (aluminum) valve covers off last week and checked the oil flow at idle. It was comforting to see a good flow at all rockers and out of the overflow tube. I installed neoprene Best Gaskets. RTV to the covers, gaskets taped into place and left to cure overnight. Then a small smear of non hardening goo to the other side. Tightened lightly, no leaks!
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Have these covers ever not leaked? are they new? Are they aftermarket, I don't know if there are any aftermarket T-bird valve covers.
This may or may not help but I'm running a set of Offenhauser cast valve covers that I bought new from Speedway and they leaked, both of them. I checked the gasket surface and found it was not flat, I set them up in a mill and ran around the gasket area to make it flat and no more leak.
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Ted (6/30/2023)
If the oil system is modified to increase the amount of oil to the top end of the engine, then the potential for the oil to be above the cylinder head valve cover rail is greatly increased. I find it necessary to install restrictors with a 0.078” orifice at each rocker arm assembly to control the amount of oil that gets to the cylinder heads when making modifications to increase the oil flow around the center cam bearing. miker (6/26/2023)
I glue the gaskets to all the cast aluminum covers I’ve used. Then use a little grease on the head side. Stops them from slipping, and seals but let’s them release to set the valve. I think Ted has something on that, hope he’ll chime in. 1946international (11/24/2023)
Have these covers ever not leaked? are they new? Are they aftermarket, I don't know if there are any aftermarket T-bird valve covers. This may or may not help but I'm running a set of Offenhauser cast valve covers that I bought new from Speedway and they leaked, both of them. I checked the gasket surface and found it was not flat, I set them up in a mill and ran around the gasket area to make it flat and no more leak. ALL of the above ... I would be concerned if the rocker cover decks are square and also the cover rails on the heads. And IF the covers are OEM or import copies. Think rifle brushes when clearing/cleaning orifices.
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... I'm wondering if the Rocker covers purchased from Speedway were made under the same circumstances as the poor performing Offy Tri- Power intake that Ted Eaton tested, along with 6 others quite some time back?.. Long story short, the Intakes were not made by the original Fred Offenhauser's company, but by a nephews company of the same last name. A law suite resulted. many years ago, but a Judges bad ruling in the case did not really resolve the issue.. Recently, an out fit in Canada popped up advertising new Offy parts.. So ??..
Paul
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